WASHINGTON — A federal choose on Tuesday accredited the blockbuster merger between AT&T and Time Warner, rebuffing the federal government’s effort to dam the $85.four billion deal, in a choice that’s anticipated to unleash a wave of takeovers in company America.

The choose, Richard J. Leon of the United States District Court in Washington, mentioned the Justice Department had not proved that the telecom firm’s acquisition of Time Warner would result in fewer decisions for shoppers and better costs for tv and web providers.

The merger would create a media and telecommunications powerhouse, reshaping the panorama of these industries. The mixed firm would have a library that features HBO’s hit “Game of Thrones” and channels like CNN, together with huge distribution attain by wi-fi and satellite tv for pc tv providers throughout the nation.

Media executives more and more say that content material creation and distribution have to be married to outlive in opposition to rising know-how firms like Amazon and Netflix. Those two firms began making their very own programming in simply the final a number of years. But these tech firms now spend billions of a yr on authentic programming, and customers can stream their video on apps in houses and on cellular gadgets, pulling consideration from conventional media companies.

Executives and buyers had watched the six-week trial intently, wanting for indicators about the way it would possibly alter their ambitions. Comcast, for instance, want to outbid the Walt Disney Company for a few of 21st Century Fox’s property, however has held off till the trial ended.

The ruling is a significant setback for the Justice Department and its antitrust chief, Makan Delrahim, whose resolution to sue to dam the deal broke with conference. Deals akin to this one, in which the 2 firms are in associated industries however don’t produce competing merchandise, are normally accredited by federal regulators.

Mr. Delrahim had insisted that the 2 firms promote some main elements earlier than getting authorities approval, a requirement that the executives rejected. That led to the Justice Department’s lawsuit, filed in November.

Judge Leon’s opinion may enhance the possibilities that different offers already reached, like CVS’s bid for Aetna and T-Mobile’s proposed merger with Sprint, will survive regulatory scrutiny.

The deal was hatched in August 2016 when Randall Stephenson, the chief govt of AT&T, referred to as Jeff Bewkes, his counterpart at Time Warner. Mr. Bewkes’s firm, with its well-liked HBO exhibits, dwell N.B.A. and N.C.A.A. sports activities broadcasting rights, and CNN, has been a takeover goal for years.

The two then had an extended lunch in the Time Warner eating room in New York and agreed that their industries have been underneath siege. The buy of Time Warner would give AT&T the premium tv content material it wanted to make its bundle of wi-fi, tv and broadband providers extra engaging to clients.

“We want people engaged with their mobile devices all day watching movies and video,” Mr. Stephenson mentioned in April through the trial.

Presidential politics clouded the merger from nearly the second it was introduced. President Trump, whereas nonetheless a candidate, mentioned he would block the deal “because it’s too much concentration of power in the hands of too few.”

Those feedback and his repeated criticism of CNN, which is owned by Time Warner’s unit Turner Broadcasting, raised hypothesis that Mr. Trump had pushed Mr. Delrahim and the Justice Department to dam the deal.

But Mr. Delrahim swore to the court docket that he was not influenced by the White House, and Judge Leon stopped many of the arguments about political interference from getting into the trial.